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THE BIG BANG THEORY Season 9 Episode 20 Photos The Big Bear Precipitation : “The Big Bear Precipitation” – Sheldon spills a secret of Leonard’s when the two take a weekend cabin trip with Penny and Amy. Also, when Koothrappali goes overboard with pregnancy gifts, Wolowitz and Bernadette must draw the line, on THE BIG BANG THEORY, Thursday, April 7 (8:00-8:31 PM, ET/PT) on the CBS Television Network.